State space visualization examples: Difference between revisions
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== Alternating Bit Protocol == | == Alternating Bit Protocol == | ||
This is a visualisation of 3643 states and 11115 transitions of a TLA+ model of the alternating bit protocol, as distributed with the [http://research.microsoft.com/en-us/um/people/lamport/tla/tlc.html|TLC model checker]. | This is a visualisation of 3643 states and 11115 transitions of a TLA+ model of the alternating bit protocol, as distributed with the [http://research.microsoft.com/en-us/um/people/lamport/tla/tlc.html| TLC model checker]. | ||
This model (MCAlternatingBit.tla) was loaded with ProB, the model checker run for a few seconds and then the command "State Space Fast Rendering" with options (scale,fast) was used. | This model (MCAlternatingBit.tla) was loaded with ProB, the model checker run for a few seconds and then the command "State Space Fast Rendering" with options (scale,fast) was used. | ||
Revision as of 17:54, 18 December 2015
Alternating Bit Protocol
This is a visualisation of 3643 states and 11115 transitions of a TLA+ model of the alternating bit protocol, as distributed with the TLC model checker. This model (MCAlternatingBit.tla) was loaded with ProB, the model checker run for a few seconds and then the command "State Space Fast Rendering" with options (scale,fast) was used.
The goal predicate rBit=1 was used; those states satisfying this predicate are shown in orange.
The main file of the model is:
--------------------------- MODULE MCAlternatingBit -------------------------
EXTENDS AlternatingBit, TLC
INSTANCE ABCorrectness
CONSTANTS msgQLen, ackQLen
SeqConstraint == /\ Len(msgQ) \leq msgQLen
/\ Len(ackQ) \leq ackQLen
SentLeadsToRcvd == \A d \in Data : (sent = d) /\ (sBit # sAck) ~> (rcvd = d)
=============================================================================
ImpliedAction == [ABCNext]_cvars
TNext == WF_msgQ(~ABTypeInv')
TProp == \A d \in Data : (sent = d) => [](sent = d)
CSpec == ABSpec /\ TNext
DataPerm == Permutations(Data)
==============================================================